There is only one unavoidable item, and it's the Missile Tank in Sector 3 right before the Super Missile download. You have to roll right through it.

12 Jan
20:00 2015

That missile is named Bob by the way.

12 Feb
19:48 2017

Easy/ez/izi

11 Mar
3:17 2018

nightmare was harder as hell his RNG is shit, it took me 30 min dying all time, ridley was easy

15 May
18:22 2018

To be fair, it could've been so much worse than 30 minutes. At least it was only 30 minutes. I still haven't tried earning this on a legit run.

11 Dec
10:57 2018

Funny story Nightmare is actually very easy if you jump over him in a clock wise way.

20 Dec
6:44 2018

I finally got this, IF ANYBODY NEED HELP MESSAGE ME I KNOW EXACTLY HOW TO DO THIS!!!!!

20 Dec
7:01 2018

https://www.youtube.com/watch?v=V5xrz6pSU3Y Here's a video of the ending and me getting the achievement, this is the final bosses sa-x and omega metroid no damage.

20 Mar
17:12 2019

I had tons of trouble with nightmare till I stopped trying to fight it the way I was used to and just had it chase me in a circle while I got pot-shots at its face.meanwhile Ridley was all sorts of rng nonsense and I honestly feel like I got lucky